The niave protocol, any time you get a note, you come up with a random password. That password has to be on the bottom of the note. If the password has even a few bits of entropy, relative to outsiders, this will work. (Memory charms or time turners can get around this, but its still a good precaution)
The niave protocol, any time you get a note, you come up with a random password. That password has to be on the bottom of the note. If the password has even a few bits of entropy, relative to outsiders, this will work. (Memory charms or time turners can get around this, but its still a good precaution)